摘要
本文针对岩石在加载系统作用下破裂过程的非稳定性问题,提出了一个简单的力学模型,用尖点灾变(Cusp)模型研究了失稳过程的机制.从理论上阐明了试验机与试样的刚度比在失稳过程中的重要作用,得到了灾变时试样的突跳量与能量释放量的简单表达式,研究结果表明,加载系统的稳定性取决于系统内部的刚度分配,失稳的条件是其刚度比不大于1.本文的讨论从整体上深化了对加载系统失稳的认识.
In this paper, a simple mechanical model is proposed for rock unstable failure under the action of a loading system, and the mechanism of instability is studied by using a cusp type catastrophic model. It is expounded theoretically the stiffness ratio, K, of the machine to the specimen plays an important role in the outbreak of instability.Simple formulas for the deformation jump and the energy release are derived.The outcome of the research shows clearly that the stability characteristic of a machine-specimen system is determined by the stiffness distribution in the system and the condition for instability is K>1.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
1990年第2期100-107,共8页
Chinese Journal of Rock Mechanics and Engineering
